Rail represents one of the most important means of transportation. Many
nondestructive testing methods have been used to find defects in rail. The guided wave technique is
the most efficient because of its long propagation characteristic along the rail. The wave structure of
the rail cross-section for a particular loading condition of modes and frequencies is an important
feature. The wave structures are examined at different modes and frequencies. The propagation
scattering patterns of guided waves from various multiple defects in a rail are also studied using
finite element method.